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JP5237622B2 - Vibration correction control circuit and imaging apparatus including the same - Google Patents

Vibration correction control circuit and imaging apparatus including the same Download PDF

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JP5237622B2
JP5237622B2 JP2007330623A JP2007330623A JP5237622B2 JP 5237622 B2 JP5237622 B2 JP 5237622B2 JP 2007330623 A JP2007330623 A JP 2007330623A JP 2007330623 A JP2007330623 A JP 2007330623A JP 5237622 B2 JP5237622 B2 JP 5237622B2
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vibration
detection element
circuit
signal
output signal
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JP2009151202A (en
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恭久 山田
裕樹 田下
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Semiconductor Components Industries LLC
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Semiconductor Components Industries LLC
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Priority to KR1020080119811A priority patent/KR101058332B1/en
Priority to US12/327,235 priority patent/US8570385B2/en
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B5/00—Adjustment of optical system relative to image or object surface other than for focusing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/68—Control of cameras or camera modules for stable pick-up of the scene, e.g. compensating for camera body vibrations
    • H04N23/682—Vibration or motion blur correction
    • H04N23/685—Vibration or motion blur correction performed by mechanical compensation
    • H04N23/687—Vibration or motion blur correction performed by mechanical compensation by shifting the lens or sensor position
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H04N23/54—Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/68—Control of cameras or camera modules for stable pick-up of the scene, e.g. compensating for camera body vibrations
    • H04N23/681—Motion detection
    • H04N23/6812—Motion detection based on additional sensors, e.g. acceleration sensors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/68—Control of cameras or camera modules for stable pick-up of the scene, e.g. compensating for camera body vibrations
    • H04N23/681—Motion detection
    • H04N23/6815—Motion detection by distinguishing pan or tilt from motion

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Adjustment Of Camera Lenses (AREA)
  • Studio Devices (AREA)

Abstract

A image stabilization control circuit is provided which comprises at least one analog-to-digital converter circuit which converts an output signal of a vibration detection element which detects vibration of an imaging device and an output signal of a position detection element which detects a position of an optical component, into digital signals, and a logic circuit which generates a control signal which drives the optical component based on the output signal of the vibration detection element which is digitized by the analog-to-digital converter circuit and the output signal of the position detection element which is digitized by the analog-to-digital converter circuit, wherein an abnormality of the vibration detection element is judged based on an amplitude of the output signal from the vibration detection element which is converted into the digital signal by the analog-to-digital converter circuit.

Description

本発明は、撮像装置に組み込まれる振動補正制御回路に関する。   The present invention relates to a vibration correction control circuit incorporated in an imaging apparatus.

近年、デジタルスチルカメラやデジタルビデオカメラ等の撮像装置は、それに備わる撮像素子の画素数を増加させることによって高画質化を実現している。その一方で、撮像装置の高画質化を実現する他の方法として、撮像装置を持つ手のぶれによって生じる被写体のぶれを防止するために、撮像装置は手振れ補正機能を備えることが望まれている。   In recent years, an image pickup apparatus such as a digital still camera or a digital video camera achieves high image quality by increasing the number of pixels of an image pickup element provided therein. On the other hand, as another method for realizing high image quality of the image pickup apparatus, it is desired that the image pickup apparatus has a camera shake correction function in order to prevent subject shake caused by hand shake with the image pickup apparatus. .

具体的には、撮像装置はジャイロセンサなどの検出素子を備え、撮像装置の振動によって生じる角速度成分に応じてレンズや撮像素子などの光学部品を駆動して被写体のぶれを防止する。これによって、撮像装置が振動しても、取得される映像信号に振動の成分が反映されることはなく、像ぶれのない高画質な映像信号を取得することができる。   Specifically, the imaging apparatus includes a detection element such as a gyro sensor, and drives an optical component such as a lens or an imaging element according to an angular velocity component generated by vibration of the imaging apparatus to prevent subject blurring. Accordingly, even when the imaging apparatus vibrates, the vibration component is not reflected in the acquired video signal, and a high-quality video signal without image blur can be acquired.

図４に、手振れ補正機能を実現するために用いられる、従来の振動補正制御回路１００のブロック図を示す。振動補正制御回路１００は撮像装置に備えられ、撮像装置に備えられる主制御回路（図示せず）の制御に応じて動作する。振動補正制御回路１００は位置検出素子１０２、レンズ駆動素子１０４及び振動検出素子１０６に接続される。   FIG. 4 is a block diagram of a conventional vibration correction control circuit 100 that is used to realize the camera shake correction function. The vibration correction control circuit 100 is provided in the imaging apparatus, and operates according to control of a main control circuit (not shown) provided in the imaging apparatus. The vibration correction control circuit 100 is connected to the position detection element 102, the lens driving element 104, and the vibration detection element 106.

位置検出素子１０２は、撮像装置に用いられるレンズの位置を検出する。位置検出素子１０２はホール素子とすることができ、レンズの絶対位置に応じた誘導電流を生じ、電圧信号を出力する。レンズ駆動素子１０４はボイスコイルモータとすることができる。振動補正制御回路１００は、レンズ駆動素子１０４に加える電圧値を調整することによってボイスコイルモータの可動コイルの位置、すなわち基準となる光軸に対するレンズの位置を制御する。レンズ駆動素子１０４は、撮像装置の基準光軸に対して垂直な面内でレンズを駆動する。振動検出素子１０６は、撮像装置の振動を検出してその結果を振動補正制御回路１００に出力する。振動検出素子１０６はジャイロセンサとすることができる。撮像装置に加えられた振動に応じた角速度信号を生成して、振動補正制御回路１００に出力する。   The position detection element 102 detects the position of a lens used in the imaging apparatus. The position detection element 102 can be a Hall element, generates an induced current according to the absolute position of the lens, and outputs a voltage signal. The lens driving element 104 can be a voice coil motor. The vibration correction control circuit 100 controls the position of the movable coil of the voice coil motor, that is, the position of the lens with respect to the reference optical axis by adjusting the voltage value applied to the lens driving element 104. The lens driving element 104 drives the lens in a plane perpendicular to the reference optical axis of the imaging apparatus. The vibration detection element 106 detects the vibration of the imaging apparatus and outputs the result to the vibration correction control circuit 100. The vibration detection element 106 can be a gyro sensor. An angular velocity signal corresponding to the vibration applied to the imaging device is generated and output to the vibration correction control circuit 100.

位置検出素子１０２、レンズ駆動素子１０４及び振動検出素子１０６はそれぞれ少なくとも２つの素子から構成されることが好適である。例えば、撮像装置の光軸に垂直な面において水平成分と垂直成分に対応した複数の素子を設けて、レンズの位置検出、レンズの移動及び撮像装置の振動検出を行う。   The position detecting element 102, the lens driving element 104, and the vibration detecting element 106 are each preferably composed of at least two elements. For example, a plurality of elements corresponding to a horizontal component and a vertical component are provided on a plane perpendicular to the optical axis of the imaging device, and lens position detection, lens movement, and vibration detection of the imaging device are performed.

次に、振動補正制御回路１００について詳細に説明する。振動補正制御回路１００は、サーボ回路１０、レンズドライバ１２、アナログ−デジタル変換回路（ＡＤＣ）１４、ＣＰＵ１６及びデジタル−アナログ変換回路（ＤＡＣ）１８を含んで構成される。   Next, the vibration correction control circuit 100 will be described in detail. The vibration correction control circuit 100 includes a servo circuit 10, a lens driver 12, an analog-digital conversion circuit (ADC) 14, a CPU 16, and a digital-analog conversion circuit (DAC) 18.

サーボ回路１０は、位置検出素子１０２の出力する電圧信号に応じて、レンズ駆動素子１０４を制御するための信号を生成する。サーボ回路１０は、外付けの抵抗素子やコンデンサ等を含んだアナログのフィルタ回路を含んで構成され、レンズの光軸と撮像装置に備えられる撮像素子の中心とが一致するように、レンズ駆動素子１０４を制御するための信号を生成する。レンズドライバ１２は、サーボ回路１０から出力された信号に基づいて、レンズ駆動素子１０４を駆動するためのレンズ駆動信号を生成する。   The servo circuit 10 generates a signal for controlling the lens driving element 104 in accordance with the voltage signal output from the position detection element 102. The servo circuit 10 is configured to include an analog filter circuit including an external resistor element, a capacitor, and the like, and a lens driving element so that the optical axis of the lens coincides with the center of the imaging element provided in the imaging device. A signal for controlling 104 is generated. The lens driver 12 generates a lens driving signal for driving the lens driving element 104 based on the signal output from the servo circuit 10.

ＡＤＣ１４は、振動検出素子１０６が出力するアナログの角速度信号をデジタル信号に変換する。ＣＰＵ１６は、デジタルの角速度信号に基づいて、撮像装置の移動量を示す角度信号を生成する。ＣＰＵ１６は、メモリ（図示しない）に接続され、メモリに格納されたソフトウェアに基づいて角度信号の生成処理を行う。ＤＡＣ１８はＣＰＵ１６で生成されたデジタルの角度信号をアナログ信号に変換する。   The ADC 14 converts the analog angular velocity signal output from the vibration detection element 106 into a digital signal. The CPU 16 generates an angle signal indicating the amount of movement of the imaging device based on the digital angular velocity signal. The CPU 16 is connected to a memory (not shown), and performs an angle signal generation process based on software stored in the memory. The DAC 18 converts the digital angle signal generated by the CPU 16 into an analog signal.

ここで、サーボ回路１０は、ＤＡＣ１８が出力するアナログの角度信号と位置検出素子１０２の出力する電圧信号とを加算した信号に応じて、レンズ駆動素子１０４を駆動するためのレンズ駆動信号を生成する。つまり、手振れによる被写体ぶれを防止するために、撮像装置の移動量を示す角度信号に基づいてレンズの位置を変更して、撮像素子上の被写体像のぶれを抑制する。これによって、手振れによる被写体像のぶれを抑制して高画質な映像信号を得ることができる。   Here, the servo circuit 10 generates a lens driving signal for driving the lens driving element 104 in accordance with a signal obtained by adding the analog angle signal output from the DAC 18 and the voltage signal output from the position detection element 102. . That is, in order to prevent subject shake due to camera shake, the position of the lens is changed based on an angle signal indicating the amount of movement of the imaging device, thereby suppressing blurring of the subject image on the image sensor. Thus, it is possible to obtain a high-quality video signal while suppressing blurring of the subject image due to camera shake.

特開平１０−２１３８３２号公報JP-A-10-213832

ところで、振動補正制御回路の処理速度を向上させるためにサーボ回路、レンズドライバ、振動検出信号の処理回路をデジタル処理することができるロジック回路に置き換えることが望まれている。さらに、振動補正制御回路はデジタルカメラ等の撮像素子や撮像素子のレンズモジュールに組み込まれるので、ロジック回路化した場合においてもできるだけ小型化することが必要である。   Incidentally, in order to improve the processing speed of the vibration correction control circuit, it is desired to replace the servo circuit, the lens driver, and the vibration detection signal processing circuit with a logic circuit capable of digital processing. Furthermore, since the vibration correction control circuit is incorporated in an image sensor such as a digital camera or a lens module of the image sensor, it is necessary to reduce the size as much as possible even when a logic circuit is formed.

また、撮像装置の製造時等において、撮像装置に組み込まれたジャイロセンサ等の振動検出素子が正常に機能しているか否かを判定するための機能を振動補正制御回路に組み込むことが望まれている。   In addition, it is desired to incorporate a function for determining whether or not a vibration detection element such as a gyro sensor incorporated in the imaging apparatus is functioning normally in the vibration correction control circuit when the imaging apparatus is manufactured. Yes.

本発明の１つの態様は、振動に応じて撮像装置の光学部品又は撮像素子を駆動して、振動による撮像への影響を低減させる振動補正制御回路であって、撮像装置の振動を検出する振動検出素子からの出力信号及び前記光学部品又は前記撮像素子の位置を検出する位置検出素子からの出力信号をデジタル信号に変換する少なくとも１つのアナログ／デジタル変換回路と、前記アナログ／デジタル変換回路でデジタル化された前記振動検出素子の出力信号と、前記アナログ／デジタル変換回路でデジタル化された前記位置検出素子の出力信号と、に基づいて、前記光学部品又は前記撮像素子を駆動するための制御信号を生成するロジック回路と、を備え、前記アナログ／デジタル変換回路でデジタル信号に変換された前記振動検出素子からの出力信号の振幅に基づいて前記振動検出素子の異常判定を行うことを特徴とする。   One aspect of the present invention is a vibration correction control circuit that drives an optical component or an image sensor of an imaging device according to vibration to reduce the influence of vibration on imaging, and detects vibration of the imaging device. At least one analog / digital conversion circuit that converts an output signal from the detection element and an output signal from the position detection element that detects the position of the optical component or the imaging element into a digital signal, and the analog / digital conversion circuit performs digital conversion Control signal for driving the optical component or the imaging device based on the output signal of the vibration detection device converted into the output signal and the output signal of the position detection device digitized by the analog / digital conversion circuit An output from the vibration detection element converted into a digital signal by the analog / digital conversion circuit And performs an abnormality determination of the vibration detecting device on the basis of the amplitude of the item.

ここで、前記ロジック回路は、撮像装置のパン動作又はチルト動作を判定するパン・チルト判定回路と、撮像時において、前記パン・チルト判定回路の判定結果に応じて前記振動検出素子からの出力信号を増幅するゲイン値を調整し、前記振動検出素子の異常判定時において、前記判定結果に依らず前記振動検出素子からの出力信号を増幅するゲイン値を所定値とするゲイン調整回路、を含み、前記ゲイン調整回路からの出力信号に基づいて前記振動検出素子の異常判定を行うことが好適である。   Here, the logic circuit includes a pan / tilt determination circuit that determines a pan operation or a tilt operation of the imaging apparatus, and an output signal from the vibration detection element according to a determination result of the pan / tilt determination circuit during imaging. A gain adjustment circuit that adjusts a gain value for amplifying an output signal from the vibration detection element regardless of the determination result at the time of abnormality determination of the vibration detection element, It is preferable to perform abnormality determination of the vibration detection element based on an output signal from the gain adjustment circuit.

また、前記ロジック回路は、撮像時において、前記アナログ／デジタル変換回路でデジタル化された前記振動検出素子からの出力信号を受けて、第１の周波数以上の信号のみを前記ゲイン調整回路へ出力し、前記振動検出素子の異常判定時において、前記アナログ／デジタル変換回路でデジタル化された前記振動検出素子からの出力信号を前記第１の周波数よりも低い第２の周波数以上の信号のみを前記ゲイン調整回路へ出力するハイパスフィルタ、を含むことが好適である。   The logic circuit receives an output signal from the vibration detection element digitized by the analog / digital conversion circuit and outputs only a signal having a frequency equal to or higher than a first frequency to the gain adjustment circuit during imaging. At the time of abnormality determination of the vibration detection element, an output signal from the vibration detection element digitized by the analog / digital conversion circuit is only gained from a signal having a second frequency lower than the first frequency. It is preferable to include a high-pass filter that outputs to the adjustment circuit.

さらに、前記振動検出素子からの出力信号の振幅が第１閾値以下、又は、前記第１閾値より大きい第２閾値以上である場合に前記振動検出素子が異常であると判定することが好適である。   Furthermore, it is preferable to determine that the vibration detection element is abnormal when the amplitude of the output signal from the vibration detection element is equal to or less than a first threshold value or equal to or greater than a second threshold value greater than the first threshold value. .

また、前記振動検出素子の出力信号を撮像時よりも大きいゲイン値で増幅した出力信号の振幅に基づいて、前記振動検出素子の異常判定を行うことが好適である。   In addition, it is preferable to perform abnormality determination of the vibration detection element based on an amplitude of an output signal obtained by amplifying the output signal of the vibration detection element with a gain value larger than that at the time of imaging.

このような振動補正制御回路は撮像装置に適用することが好適である。例えば、本発明の振動補正制御回路を備えた撮像装置であって、前記振動検出素子と、前記光学部品又は前記撮像素子の位置を検出する位置検出素子と、前記振動補正制御回路に接続され、前記制御信号に応じて前記光学部品又は前記撮像素子を駆動する駆動素子と、を備えることが好適である。   Such a vibration correction control circuit is preferably applied to an imaging apparatus. For example, an image pickup apparatus including the vibration correction control circuit of the present invention, connected to the vibration detection element, a position detection element for detecting the position of the optical component or the image pickup element, and the vibration correction control circuit, It is preferable to include a drive element that drives the optical component or the image sensor in accordance with the control signal.

本発明によれば、ロジック回路化された振動補正制御回路をより小型化することができる。また、ジャイロセンサ等の振動検出素子が正常であるか否かを判定することができる。   According to the present invention, the vibration correction control circuit formed into a logic circuit can be further reduced in size. Further, it can be determined whether or not a vibration detection element such as a gyro sensor is normal.

本発明の実施形態における振動補正制御回路２００は、図１の機能ブロック図に示すように、アナログ／デジタル変換回路（ＡＤＣ）２０、加算回路２２、サーボ回路２４、ハイパスフィルタ（ＨＰＦ）２６、パン・チルト判定回路２８、ゲイン調整回路３０、積分回路３２、センタリング処理回路３４、デジタル／アナログ変換回路（ＤＡＣ）３６及びＣＰＵ３８を含んで構成される。   As shown in the functional block diagram of FIG. 1, the vibration correction control circuit 200 according to the embodiment of the present invention includes an analog / digital conversion circuit (ADC) 20, an adder circuit 22, a servo circuit 24, a high-pass filter (HPF) 26, a panning circuit. A tilt determination circuit 28, a gain adjustment circuit 30, an integration circuit 32, a centering processing circuit 34, a digital / analog conversion circuit (DAC) 36, and a CPU 38 are configured.

振動補正制御回路２００は、位置検出素子１０２、レンズ駆動素子１０４、振動検出素子１０６に接続される。これらの素子は従来技術に記載のものと同様である。すなわち、位置検出素子１０２は、レンズ駆動素子１０４で駆動されるレンズの位置を少なくとも直交変換可能なように測定できるように少なくとも２軸以上に対して設けられる。また、振動検出素子１０６も、ヨー方向及びピッチ方向の２軸に沿って振動の成分を直交変換可能なように少なくとも２軸以上に対して設けられる。   The vibration correction control circuit 200 is connected to the position detection element 102, the lens driving element 104, and the vibration detection element 106. These elements are the same as those described in the prior art. That is, the position detection element 102 is provided with respect to at least two axes so that the position of the lens driven by the lens driving element 104 can be measured so as to be at least orthogonally transformable. The vibration detection element 106 is also provided for at least two axes so that vibration components can be orthogonally transformed along two axes in the yaw direction and the pitch direction.

本実施の形態では、撮像装置のヨー方向（Ｘ軸方向）及びピッチ方向（Ｙ軸方向）についてレンズ位置及び振動を検出できるように位置検出素子１０２及び振動検出素子１０６を設置するものとして説明を行う。以下の説明では、位置検出素子１０２及び振動検出素子１０６の出力信号はＸ軸成分同士、Ｙ軸成分同士で加算処理などされ、それぞれに基づいてヨー方向（Ｘ軸方向）及びピッチ方向（Ｙ軸方向）にレンズ位置が制御される。   In the present embodiment, it is assumed that the position detection element 102 and the vibration detection element 106 are installed so that the lens position and vibration can be detected in the yaw direction (X-axis direction) and pitch direction (Y-axis direction) of the imaging apparatus. Do. In the following description, the output signals of the position detection element 102 and the vibration detection element 106 are subjected to addition processing between the X-axis components and the Y-axis components, and the yaw direction (X-axis direction) and pitch direction (Y-axis) The lens position is controlled in the direction).

なお、被写体の移動などに応じて撮像装置を水平方向（ヨー方向）に動かすことをパン動作といい、鉛直方向（ピッチ方向）に移動させることをチルト動作という。   Note that moving the imaging device in the horizontal direction (yaw direction) in accordance with the movement of the subject is referred to as panning operation, and moving in the vertical direction (pitch direction) is referred to as tilting operation.

ＡＤＣ２０は、位置検出素子１０２、例えばホール素子から出力されたアナログの電圧信号をデジタル信号に変換する。ホール素子は、レンズに固定された磁石による磁力に応じた誘導電流を生成する。つまり、ホール素子は、レンズとの距離に応じてレンズの位置を示す電圧信号を出力し、ＡＤＣ２０はその電圧信号をデジタル信号に変換して位置信号として出力する。ＡＤＣ２０は、レンズの光軸と撮像装置に備えられる撮像素子の中心とが一致する場合に、基準を示す信号、例えば、“０”を示すデジタル値を出力する構成とする。   The ADC 20 converts an analog voltage signal output from the position detection element 102, for example, a Hall element, into a digital signal. The Hall element generates an induced current corresponding to the magnetic force generated by the magnet fixed to the lens. That is, the Hall element outputs a voltage signal indicating the position of the lens according to the distance from the lens, and the ADC 20 converts the voltage signal into a digital signal and outputs it as a position signal. The ADC 20 is configured to output a signal indicating a reference, for example, a digital value indicating “0”, when the optical axis of the lens coincides with the center of the image sensor provided in the imaging device.

また、ＡＤＣ２０は、振動検出素子１０６、例えばジャイロセンサから出力されたアナログの角速度信号をデジタル信号に変換する。すなわち、ＡＤＣ２０は、位置検出素子１０２及び振動検出素子１０６からの出力信号を時分割でデジタル化して出力する。   Further, the ADC 20 converts an analog angular velocity signal output from the vibration detection element 106, for example, a gyro sensor, into a digital signal. That is, the ADC 20 digitizes and outputs the output signals from the position detection element 102 and the vibration detection element 106 in a time division manner.

具体的には、振動検出素子１０６で検出される振動のＸ軸成分の信号（Ｇｙｒｏ−Ｘ）、振動のＹ軸成分の信号（Ｇｙｒｏ−Ｙ）、位置検出素子１０２で検出されるレンズの位置のＸ軸成分の信号（Ｈａｌｌ−Ｘ）、位置のＹ軸成分の信号（Ｈａｌｌ−Ｙ）をデジタル化して出力する。ＡＤＣ２０は、信号（Ｇｙｒｏ−Ｘ，Ｇｙｒｏ−Ｙ）はＨＰＦ２６へ出力し、信号（Ｈａｌｌ−Ｘ，Ｈａｌｌ−Ｙ）は加算回路２２へ出力する。   Specifically, the X-axis component signal (Gyro-X) of the vibration detected by the vibration detection element 106, the Y-axis component signal (Gyro-Y) of the vibration, and the lens position detected by the position detection element 102 The X-axis component signal (Hall-X) and the position Y-axis component signal (Hall-Y) are digitized and output. The ADC 20 outputs the signals (Gyro-X, Gyro-Y) to the HPF 26 and outputs the signals (Hall-X, Hall-Y) to the adder circuit 22.

ＨＰＦ２６は、通常の撮像モード時には、角速度信号に含まれる直流成分を除去し、撮像装置の振動が反映された角速度信号の高周波成分を抽出し、パン・チルト判定回路２８及びゲイン調整回路３０へ出力する。一方、振動検出素子１０６の異常判定モード時には、ＨＰＦ２６は、入力された信号をそのままパン・チルト判定回路２８及びゲイン調整回路３０へ出力する。   In the normal imaging mode, the HPF 26 removes a DC component included in the angular velocity signal, extracts a high-frequency component of the angular velocity signal reflecting the vibration of the imaging device, and outputs it to the pan / tilt determination circuit 28 and the gain adjustment circuit 30. To do. On the other hand, in the abnormality determination mode of the vibration detection element 106, the HPF 26 outputs the input signal as it is to the pan / tilt determination circuit 28 and the gain adjustment circuit 30.

ＨＰＦ２６は、ＣＰＵ３８からのモード設定信号を受けて、通常の撮像モード及び異常判定モードのいずれか一方に排他的に設定される。ＨＰＦ２６は、デジタルフィルタの一種であるタップフィルタ等で構成することができる。通常の撮像モードと異常判定モードとのフィルタ特性の切り替えは、タップフィルタの各タップ係数を変更することによって行うことができる。   The HPF 26 receives the mode setting signal from the CPU 38 and is exclusively set to one of the normal imaging mode and the abnormality determination mode. The HPF 26 can be configured by a tap filter or the like which is a kind of digital filter. Switching of the filter characteristics between the normal imaging mode and the abnormality determination mode can be performed by changing each tap coefficient of the tap filter.

パン・チルト判定回路２８は、ＨＰＦ２６の出力する角速度信号に基づいて、撮像装置のパン動作、チルト動作を検出する。パン・チルト判定回路２８は、一定期間角速度信号が所定値以上となることを検出したときに、パン動作中またはチルト動作中であると判定する。   The pan / tilt determination circuit 28 detects the pan operation and tilt operation of the imaging apparatus based on the angular velocity signal output from the HPF 26. The pan / tilt determination circuit 28 determines that the pan operation or the tilt operation is being performed when it is detected that the angular velocity signal exceeds a predetermined value for a certain period.

ゲイン調整回路３０は、撮像時には、パン・チルト判定回路２８の判定結果に応じてＨＰＦ２６から出力される角速度信号の増幅率を変更して、変更された増幅率で増幅した信号を出力する。例えば、パン動作中またはチルト動作中でない場合には、ゲイン調整回路３０はＨＰＦ２６が出力する角速度信号の強度を維持するようなゲイン調整を行う。また、パン動作中またはチルト動作中の場合には、ゲイン調整回路３０はＨＰＦ２６が出力する角速度信号の強度を減衰して出力が０となるようなゲイン調整を行う。   The gain adjustment circuit 30 changes the amplification factor of the angular velocity signal output from the HPF 26 according to the determination result of the pan / tilt determination circuit 28 during imaging, and outputs a signal amplified with the changed amplification factor. For example, when the panning operation or the tilting operation is not performed, the gain adjustment circuit 30 performs gain adjustment so as to maintain the intensity of the angular velocity signal output from the HPF 26. When the pan operation or the tilt operation is being performed, the gain adjustment circuit 30 performs gain adjustment so that the intensity of the angular velocity signal output from the HPF 26 is attenuated and the output becomes zero.

一方、振動検出素子１０６の異常判定モード時には、ゲイン調整回路３０は、パン・チルト判定回路２８の判定結果に関わらず、ＨＰＦ２６から出力される角速度信号を増幅してＣＰＵ３８へ出力する。   On the other hand, in the abnormality determination mode of the vibration detection element 106, the gain adjustment circuit 30 amplifies the angular velocity signal output from the HPF 26 and outputs it to the CPU 38 regardless of the determination result of the pan / tilt determination circuit 28.

ゲイン調整回路３０は、ＣＰＵ３８からのモード設定信号を受けて、通常の撮像モード及び異常判定モードのいずれか一方に排他的に設定される。   The gain adjustment circuit 30 receives the mode setting signal from the CPU 38 and is exclusively set to one of the normal imaging mode and the abnormality determination mode.

積分回路３２は、ＨＰＦ２６が出力する角速度信号（Ｇｙｒｏ−Ｘ，Ｇｙｒｏ−Ｙ）を積分して、撮像装置の移動量を示す角度信号を生成する。積分回路３２は、図示しないデジタルフィルタを含んで構成することが好適であり、図示しないレジスタに設定されたフィルタ係数に応じたフィルタ処理を行うことによって角速度信号を９０°だけ遅延させて角度信号、つまり撮像装置の移動量を求める。   The integration circuit 32 integrates the angular velocity signals (Gyro-X, Gyro-Y) output from the HPF 26 to generate an angle signal indicating the amount of movement of the imaging device. The integration circuit 32 is preferably configured to include a digital filter (not shown), and the angular velocity signal is delayed by 90 ° by performing a filter process according to a filter coefficient set in a register (not shown). That is, the movement amount of the imaging device is obtained.

撮像装置において手振れ補正処理を行う場合、補正処理を継続して実行するうちにレンズの位置が基準位置から徐々に離れていき、レンズの可動範囲の限界点付近に達する場合がある。このとき、手振れ補正処理を継続すると、レンズはある一方の方向には移動できるが、他方には移動できなくなる。センタリング処理回路３４はこれを防止するために設けられるものである。   When camera shake correction processing is performed in the imaging apparatus, the lens position gradually moves away from the reference position while the correction processing is continuously performed, and may reach the vicinity of the limit point of the movable range of the lens. At this time, if the camera shake correction process is continued, the lens can move in one direction but cannot move in the other direction. The centering processing circuit 34 is provided to prevent this.

加算回路２２は、ＡＤＣ２０の出力する位置信号（Ｈａｌｌ−Ｘ）とセンタリング処理回路３４によって位相調整された振動成分信号（ＳＶ−Ｘ）を加算し、また、ＡＤＣ２０の出力する位置信号（Ｈａｌｌ−Ｙ）とセンタリング処理回路３４によって位相調整された振動成分信号（ＳＶ−Ｙ）を加算してサーボ回路２４へ出力する。   The adder circuit 22 adds the position signal (Hall-X) output from the ADC 20 and the vibration component signal (SV-X) phase-adjusted by the centering processing circuit 34, and also outputs the position signal (Hall-Y) output from the ADC 20. ) And the vibration component signal (SV-Y) phase-adjusted by the centering processing circuit 34 are added and output to the servo circuit 24.

サーボ回路２４は、加算回路２２からの出力信号に応じて、レンズ駆動素子１０４の駆動を制御する補正信号ＳＲを生成する。サーボ回路２４は、レジスタとデジタルフィルタ回路を含んで構成され、レジスタに格納されるフィルタ係数を用いたフィルタ処理を行う。   The servo circuit 24 generates a correction signal SR that controls the driving of the lens driving element 104 in accordance with the output signal from the adding circuit 22. The servo circuit 24 includes a register and a digital filter circuit, and performs a filter process using a filter coefficient stored in the register.

ＤＡＣ３６はデジタルの補正信号ＳＲをアナログ信号に変換する。ＤＡＣ３６によってアナログ化された補正信号ＳＲに基づいて、レンズ駆動素子１０４によりＸ軸方向及びＹ軸方向についてそれぞれ撮像装置のレンズが駆動される。   The DAC 36 converts the digital correction signal SR into an analog signal. Based on the correction signal SR analogized by the DAC 36, the lens driving element 104 drives the lens of the imaging device in the X-axis direction and the Y-axis direction, respectively.

ＣＰＵ３８は、振動補正制御回路２００を統合的に制御する。ＣＰＵ３８は、振動補正制御回路２００の各部のフィルタ係数（タップフィルタのタップ係数等）、ゲイン値等を設定する。また、振動補正制御回路２００の外部に設けられた撮像装置の主制御部（メインＣＰＵ等）２０２からモード設定信号を受けて、振動補正制御回路２００を通常の撮像モード又は振動検出素子の異常判定モードに設定する。   The CPU 38 controls the vibration correction control circuit 200 in an integrated manner. The CPU 38 sets a filter coefficient (such as a tap coefficient of a tap filter) and a gain value of each part of the vibration correction control circuit 200. Further, upon receiving a mode setting signal from the main control unit (main CPU or the like) 202 of the image pickup apparatus provided outside the vibration correction control circuit 200, the vibration correction control circuit 200 determines whether the normal image pickup mode or vibration detection element is abnormal. Set to mode.

＜撮像時の手ぶれ補正処理＞
振動補正制御回路２００を用いた、手振れによる被写体のぶれを補正するためのレンズの移動制御について説明する。通常の撮像時において手ぶれ補正を行う場合、ＣＰＵ３８は通常の撮像モードに設定するモード設定信号をＨＰＦ２６及びゲイン調整回路３０へ出力し、ＨＰＦ２６及びゲイン調整回路３０は通常の撮像モードに設定される。 <Image stabilization processing during imaging>
The lens movement control for correcting the shake of the subject due to the camera shake using the vibration correction control circuit 200 will be described. When camera shake correction is performed during normal imaging, the CPU 38 outputs a mode setting signal for setting the normal imaging mode to the HPF 26 and the gain adjustment circuit 30, and the HPF 26 and the gain adjustment circuit 30 are set to the normal imaging mode.

まず、手振れによる被写体のぶれのない場合について説明する。レンズ駆動素子１０４によって駆動されるレンズの位置は、その光軸と撮像装置に備えられる撮像素子の中心が一致するため、ＡＤＣ２０は“０”を示すデジタルの位置信号（Ｈａｌｌ−Ｘ，Ｈａｌｌ−Ｙ）を出力する。サーボ回路２４は、位置信号（Ｈａｌｌ−Ｘ，Ｈａｌｌ−Ｙ）の値が“０”のとき、現在のレンズの位置を維持するようにレンズ駆動素子１０４を制御する補正信号ＳＲを出力する。   First, a case where there is no subject shake due to camera shake will be described. The position of the lens driven by the lens driving element 104 is such that the optical axis coincides with the center of the image pickup element provided in the image pickup apparatus, so that the ADC 20 outputs a digital position signal (Hall-X, Hall-Y) indicating “0”. ) Is output. When the value of the position signal (Hall-X, Hall-Y) is “0”, the servo circuit 24 outputs a correction signal SR for controlling the lens driving element 104 so as to maintain the current lens position.

また、レンズの光軸と撮像素子の中心とが一致しない場合、ＡＤＣ２０は“０”と異なる値を示すデジタルの位置信号（Ｈａｌｌ−Ｘ，Ｈａｌｌ−Ｙ）を出力する。サーボ回路２４は、ＡＤＣ２０の出力する値に応じて、位置信号（Ｈａｌｌ−Ｘ，Ｈａｌｌ−Ｙ）の値が“０”となるようにレンズ駆動素子１０４を制御する補正信号ＳＲを出力する。上記の動作を繰り返すことによって、レンズの光軸と撮像素子の中心とが一致するように、レンズの位置を制御する。   If the optical axis of the lens does not match the center of the image sensor, the ADC 20 outputs a digital position signal (Hall-X, Hall-Y) indicating a value different from “0”. The servo circuit 24 outputs a correction signal SR for controlling the lens driving element 104 so that the value of the position signal (Hall-X, Hall-Y) becomes “0” according to the value output from the ADC 20. By repeating the above operation, the lens position is controlled so that the optical axis of the lens coincides with the center of the image sensor.

次に、手振れによって被写体のぶれが生じた場合について説明する。レンズ駆動素子１０４によって駆動されるレンズの位置は、その光軸と撮像装置に備えられる撮像素子の中心が一致するため、ＡＤＣ２０は“０”を示すデジタルの位置信号（Ｈａｌｌ−Ｘ，Ｈａｌｌ−Ｙ）を出力する。一方、手振れによって撮像装置が移動するため、積分回路３２及びセンタリング処理回路３４は撮像装置の移動量を示す振動成分信号（ＳＶ−Ｘ，ＳＶ−Ｙ）を出力する。   Next, a case where the subject shakes due to camera shake will be described. The position of the lens driven by the lens driving element 104 is such that the optical axis coincides with the center of the image pickup element provided in the image pickup apparatus, so that the ADC 20 outputs a digital position signal (Hall-X, Hall-Y) indicating “0”. ) Is output. On the other hand, since the imaging apparatus moves due to camera shake, the integrating circuit 32 and the centering processing circuit 34 output vibration component signals (SV-X, SV-Y) indicating the movement amount of the imaging apparatus.

サーボ回路２４は、ＡＤＣ２０が出力する“０”を示す位置信号（Ｈａｌｌ−Ｘ）とセンタリング処理回路３４が出力する振動成分信号（ＳＶ−Ｘ）とを加算した信号に応じて補正信号ＳＲを生成する。このとき、位置信号（Ｈａｌｌ−Ｘ）は“０”であるにも関わらず、“０”でない振動成分信号（ＳＶ−Ｘ）が加算されているため、サーボ回路２４はレンズを移動させる補正信号ＳＲを生成する。この補正信号ＳＲに応じてＸ軸のレンズ駆動素子１０４を制御する。同様に、ＡＤＣ２０が出力する“０”を示す位置信号（Ｈａｌｌ−Ｙ）とセンタリング処理回路３４が出力する振動成分信号（ＳＶ−Ｙ）とを加算した信号に応じて、補正信号ＳＲを生成する。このとき、位置信号（Ｈａｌｌ−Ｙ）は“０”であるにも関わらず、“０”でない振動成分信号（ＳＶ−Ｙ）が加算されているため、サーボ回路２４はレンズを移動させる補正信号ＳＲを生成する。この補正信号ＳＲに応じてＹ軸のレンズ駆動素子１０４を制御する。サーボ回路２４が出力する補正信号ＳＲに基づいて、レンズ駆動素子１０４はレンズを移動させるため、撮像装置に備えられた撮像素子は手振れによる被写体のぶれを抑制した信号を得ることができる。このような制御を繰り返すことによって、振動補正制御回路２００は手振れ補正制御を実現している。   The servo circuit 24 generates a correction signal SR according to a signal obtained by adding the position signal (Hall-X) indicating “0” output from the ADC 20 and the vibration component signal (SV-X) output from the centering processing circuit 34. To do. At this time, since the vibration component signal (SV-X) that is not “0” is added even though the position signal (Hall-X) is “0”, the servo circuit 24 corrects the correction signal for moving the lens. SR is generated. The X-axis lens driving element 104 is controlled in accordance with the correction signal SR. Similarly, the correction signal SR is generated according to a signal obtained by adding the position signal (Hall-Y) indicating “0” output from the ADC 20 and the vibration component signal (SV-Y) output from the centering processing circuit 34. . At this time, although the position signal (Hall-Y) is “0”, the vibration component signal (SV-Y) that is not “0” is added, so the servo circuit 24 corrects the correction signal for moving the lens. SR is generated. The Y-axis lens driving element 104 is controlled according to the correction signal SR. Since the lens driving element 104 moves the lens based on the correction signal SR output from the servo circuit 24, the imaging element provided in the imaging apparatus can obtain a signal that suppresses blurring of the subject due to camera shake. By repeating such control, the vibration correction control circuit 200 realizes camera shake correction control.

本発明の実施形態では、振動検出素子１０６から得られた角速度信号から撮像装置の移動量を示す角度信号を生成する際、ＨＰＦ２６、積分回路３２及びセンタリング処理回路３４を用いて生成する構成とした。これによって、角度信号の生成のためにＣＰＵ３８を用いる必要がなくなり、振動補正制御回路２００での消費電力を低減することができる。   In the embodiment of the present invention, when an angle signal indicating the amount of movement of the imaging device is generated from the angular velocity signal obtained from the vibration detecting element 106, the angle signal is generated using the HPF 26, the integrating circuit 32, and the centering processing circuit 34. . As a result, it is not necessary to use the CPU 38 for generating the angle signal, and the power consumption in the vibration correction control circuit 200 can be reduced.

また、本発明の実施形態では、振動補正制御回路２００はＨＰＦ２６、積分回路３２及びセンタリング処理回路３４を設ける構成としたことによって、ＣＰＵ３８によって上記処理を行う構成に比べて回路面積を縮小することが可能となる。これによって、振動補正制御回路２００が搭載される半導体チップのコストを低減することが可能となる。   In the embodiment of the present invention, the vibration correction control circuit 200 includes the HPF 26, the integration circuit 32, and the centering processing circuit 34, so that the circuit area can be reduced as compared with the configuration in which the CPU 38 performs the above processing. It becomes possible. As a result, the cost of the semiconductor chip on which the vibration correction control circuit 200 is mounted can be reduced.

＜振動検出素子の異常判定処理＞
次に、振動補正制御回路２００を用いた、振動検出素子１０６の異常判定処理について説明する。振動検出素子１０６の異常判定処理を行う場合、ＣＰＵ３８は異常判定モードに設定するモード設定信号をＨＰＦ２６及びゲイン調整回路３０へ出力し、ＨＰＦ２６及びゲイン調整回路３０は異常判定モードに設定される。振動検出素子１０６の異常判定処理を行う場合、振動が生じないように撮像装置は固定して行う。 <Abnormality judgment processing of vibration detection element>
Next, an abnormality determination process for the vibration detection element 106 using the vibration correction control circuit 200 will be described. When performing the abnormality determination process of the vibration detection element 106, the CPU 38 outputs a mode setting signal for setting the abnormality determination mode to the HPF 26 and the gain adjustment circuit 30, and the HPF 26 and the gain adjustment circuit 30 are set to the abnormality determination mode. When performing the abnormality determination process of the vibration detection element 106, the imaging apparatus is fixed so that vibration does not occur.

撮像装置が固定され、振動検出素子１０６が振動を検出していない場合であっても、図２のラインＡに示すように、正常に機能している振動検出素子１０６は微弱な振動信号を出力し続けている。一方、振動検出素子１０６が正常に機能していない場合や振動検出素子１０６が振動補正制御回路２００に正常に接続されていない場合には、図２のラインＢに示すように正常時よりも大きな振幅を有するノイズが重畳したり、図２のラインＣに示すように正常時よりも振幅が小さくなったりする。   Even when the imaging apparatus is fixed and the vibration detection element 106 does not detect vibration, the normally functioning vibration detection element 106 outputs a weak vibration signal as shown by line A in FIG. I keep doing it. On the other hand, when the vibration detection element 106 is not functioning normally or when the vibration detection element 106 is not normally connected to the vibration correction control circuit 200, as shown in line B of FIG. Noise having amplitude may be superimposed, or the amplitude may be smaller than normal, as indicated by line C in FIG.

振動検出素子１０６からの出力信号（Ｇｙｒｏ−Ｘ，Ｇｙｒｏ−Ｙ）は、ＡＤＣ２０によりデジタル化されてＨＰＦ２６へ入力される。異常判定モードでは、ＨＰＦ２６は無効化されており、入力された信号をそのままパン・チルト判定回路２８及びゲイン調整回路３０へ出力する。ゲイン調整回路３０は、パン・チルト判定回路２８における判定結果に関わらず、振動検出素子１０６からの出力信号を所定のゲイン値（通常の撮像モードのときよりも大きいゲイン値）で増幅してＣＰＵ３８へ出力する。   Output signals (Gyro-X, Gyro-Y) from the vibration detection element 106 are digitized by the ADC 20 and input to the HPF 26. In the abnormality determination mode, the HPF 26 is invalidated, and the input signal is output to the pan / tilt determination circuit 28 and the gain adjustment circuit 30 as they are. The gain adjustment circuit 30 amplifies the output signal from the vibration detection element 106 with a predetermined gain value (a gain value larger than that in the normal imaging mode) regardless of the determination result in the pan / tilt determination circuit 28, and the CPU 38. Output to.

ＣＰＵ３８は、ゲイン調整回路３０で増幅された振動検出素子１０６からの出力信号を受けて、その入力信号の振幅に基づいて異常判定処理を行う。例えば、図３に示すように、入力信号の振幅が第１閾値ＴＨ１より大きく、かつ、第２閾値ＴＨ２より小さい範囲（図３中のハッチングを施した範囲）にあれば振動検出素子１０６が正常であると判定する。一方、入力信号の振幅が第１閾値ＴＨ１以下、又は、第２閾値ＴＨ２以上の範囲（図３中のハッチングを施していない範囲）にあれば振動検出素子１０６が異常であると判定する。図３では、説明を分かり易くするためにアナログ信号で描いているが、実際にはデジタル信号である。   The CPU 38 receives the output signal from the vibration detection element 106 amplified by the gain adjustment circuit 30, and performs an abnormality determination process based on the amplitude of the input signal. For example, as shown in FIG. 3, if the amplitude of the input signal is in a range (the hatched range in FIG. 3) smaller than the first threshold TH1 and smaller than the second threshold TH2, the vibration detecting element 106 is normal. It is determined that On the other hand, if the amplitude of the input signal is in the range of the first threshold TH1 or less or the second threshold TH2 or more (the range in which hatching is not performed in FIG. 3), it is determined that the vibration detecting element 106 is abnormal. In FIG. 3, the analog signal is drawn for easy understanding, but it is actually a digital signal.

本実施の形態のように、ＨＰＦ２６が無効化され、入力された信号をそのままゲイン調整回路３０へ出力することにより、異常判定モード時の振動検出素子１０６の微弱な振動信号が直接増幅されるので、異常判定処理をより正確に行うことができ好適である。ただし、異常判定モード時のＨＰＦ２６のフィルタ特性を通常の撮像モード時よりも低周波成分を透過するように設定することも有用であるし、通常の撮像モード時と同じにすることも可能である。   Since the HPF 26 is invalidated and the input signal is output to the gain adjustment circuit 30 as it is as in the present embodiment, the weak vibration signal of the vibration detection element 106 in the abnormality determination mode is directly amplified. It is preferable that the abnormality determination process can be performed more accurately. However, it is useful to set the filter characteristics of the HPF 26 in the abnormality determination mode so as to transmit a lower frequency component than in the normal imaging mode, and it is also possible to make it the same as in the normal imaging mode. .

ＣＰＵ３８は、必要に応じて、判定結果を外部の主制御部（メインＣＰＵ等）２０２に出力する。   The CPU 38 outputs the determination result to an external main control unit (main CPU or the like) 202 as necessary.

以上のように、振動補正制御回路２００では振動検出素子１０６の異常判定処理を行うことができる。これにより、例えば、撮像装置の出荷前に、組み込まれたジャイロセンサ等の振動検出素子が正常であるか異常であるかを判定することができる。   As described above, the vibration correction control circuit 200 can perform the abnormality determination process for the vibration detection element 106. Thereby, for example, it is possible to determine whether a vibration detection element such as a built-in gyro sensor is normal or abnormal before shipment of the imaging apparatus.

なお、本実施の形態では、ゲイン調整回路３０のゲイン値を通常の撮像モードのときよりも大きいものとしたが、振動検出素子１０６とＡＤＣ２０の間にある増幅回路のゲイン値を通常の撮像モードのときよりも大きくしてもよい。また、本実施の形態では、ゲイン調整回路３０で増幅された信号を用いて異常判定処理を行ったがこれに限定されるものではなく、ＡＤＣ２０においてデジタル化された後の信号であればよい。例えば、ＡＤＣ２０の出力信号をＣＰＵ３８へ直接出力し、その信号に基づいて異常判定を行ってもよい。   In the present embodiment, the gain value of the gain adjustment circuit 30 is set to be larger than that in the normal imaging mode. However, the gain value of the amplifier circuit between the vibration detection element 106 and the ADC 20 is set to the normal imaging mode. It may be larger than the case of. In the present embodiment, the abnormality determination process is performed using the signal amplified by the gain adjustment circuit 30, but the present invention is not limited to this, and any signal after being digitized by the ADC 20 may be used. For example, the output signal of the ADC 20 may be directly output to the CPU 38, and abnormality determination may be performed based on the signal.

なお、本発明の実施形態では、位置検出素子１０２、レンズ駆動素子１０４、振動検出素子１０６はそれぞれ、ホール素子、ボイスコイルモータ、ジャイロセンサとしたが、本願はそれに限られるものではない。例えば、レンズ駆動素子１０４はピエゾ素子を用いることができる。また、振動検出素子１０６は、直線方向の加速度を検出するセンサを用いて、加速度信号に基づいて撮像装置の振動を検出する構成とすることができる。   In the embodiment of the present invention, the position detection element 102, the lens driving element 104, and the vibration detection element 106 are a hall element, a voice coil motor, and a gyro sensor, respectively, but the present application is not limited thereto. For example, the lens driving element 104 can be a piezo element. Further, the vibration detection element 106 can be configured to detect vibration of the imaging device based on an acceleration signal using a sensor that detects acceleration in a linear direction.

また、本発明の実施形態では、レンズを駆動させて手振れ補正処理を行うレンズシフト方式としたが、本発明はこれに限られるものではない。たとえば、本発明は、撮像装置のぶれに応じてＣＣＤ素子などの撮像素子をシフトさせる撮像素子シフト方式にも適用することができる。このとき、位置検出素子１０２は撮像素子の位置を検出し、レンズ駆動素子１０４は撮像素子を駆動する素子とすることができる。   In the embodiment of the present invention, the lens shift method is performed in which the lens is driven to perform the camera shake correction process. However, the present invention is not limited to this. For example, the present invention can also be applied to an image pickup element shift method in which an image pickup element such as a CCD element is shifted in accordance with the shake of the image pickup apparatus. At this time, the position detection element 102 can detect the position of the imaging element, and the lens driving element 104 can be an element that drives the imaging element.

本発明の実施の形態における振動補正制御回路の構成を示す図である。It is a figure which shows the structure of the vibration correction control circuit in embodiment of this invention. 本発明の実施の形態における正常時及び異常時における振動検出素子の出力信号を示す図である。It is a figure which shows the output signal of the vibration detection element at the time of normal and abnormality in embodiment of this invention. 本発明の実施の形態における振動検出素子の異常判定処理を説明する図である。It is a figure explaining the abnormality determination process of the vibration detection element in embodiment of this invention. 従来の振動補正制御回路の構成を示す図である。It is a figure which shows the structure of the conventional vibration correction control circuit.

符号の説明Explanation of symbols

１０ サーボ回路、１２ レンズドライバ、２０ アナログ／デジタル変換回路、２２ 加算回路、２４ サーボ回路、２６ ハイパスフィルタ、２８ パン・チルト判定回路、３０ ゲイン調整回路、３２ 積分回路、３４ センタリング処理回路、３６ デジタル／アナログ変換回路、３８ ＣＰＵ、１００，２００ 振動補正制御回路、１０２ 位置検出素子、１０４ レンズ駆動素子、１０６ 振動検出素子、２０２ 主制御部。   DESCRIPTION OF SYMBOLS 10 Servo circuit, 12 Lens driver, 20 Analog / digital conversion circuit, 22 Adder circuit, 24 Servo circuit, 26 High pass filter, 28 Pan / tilt determination circuit, 30 Gain adjustment circuit, 32 Integration circuit, 34 Centering processing circuit, 36 Digital / Analog conversion circuit, 38 CPU, 100, 200 Vibration correction control circuit, 102 Position detection element, 104 Lens drive element, 106 Vibration detection element, 202 Main control unit.

Claims (5)

振動に応じて撮像装置の光学部品又は撮像素子を駆動して、振動による撮像への影響を低減させる振動補正制御回路であって、
撮像装置の振動を検出する振動検出素子からの出力信号及び前記光学部品又は前記撮像素子の位置を検出する位置検出素子からの出力信号をデジタル信号に変換する少なくとも１つのアナログ／デジタル変換回路と、
前記アナログ／デジタル変換回路でデジタル化された前記振動検出素子の出力信号と、前記アナログ／デジタル変換回路でデジタル化された前記位置検出素子の出力信号と、に基づいて、前記光学部品又は前記撮像素子を駆動するための制御信号を生成するロジック回路と、を備え、
前記ロジック回路は、
前記振動検出素子の出力信号を処理するハイパスフィルタと、
前記ハイパスフィルタで処理された前記振動検出素子からの出力信号から撮像装置のパン動作又はチルト動作を判定するパン・チルト判定回路と、
撮像時において、前記パン・チルト判定回路の判定結果に応じて前記ハイパスフィルタで処理された前記振動検出素子からの出力信号を増幅するゲイン値を調整し、
前記振動検出素子の異常判定時において、前記判定結果に依らず前記振動検出素子からの出力信号を増幅するゲイン値を所定値とするゲイン調整回路、を含み、
前記ハイパスフィルタを無効化するとともに、パン動作及びチルト動作並びに手振れ動作がない状態に撮像装置を固定し、前記アナログ／デジタル変換回路でデジタル信号に変換された前記振動検出素子からの出力信号の振幅を増幅した前記ゲイン調整回路からの出力信号に基づいて、前記ゲイン調整回路からの出力信号が所定の振幅範囲にない場合に前記振動検出素子が異常であるとの異常判定を行うことを特徴とする振動補正制御回路。 A vibration correction control circuit that drives an optical component or an image sensor of an image pickup device according to vibration to reduce the influence on the image pickup due to vibration,
At least one analog / digital conversion circuit that converts an output signal from a vibration detection element that detects vibration of the imaging device and an output signal from a position detection element that detects the position of the optical component or the imaging element into a digital signal;
Based on the output signal of the vibration detection element digitized by the analog / digital conversion circuit and the output signal of the position detection element digitized by the analog / digital conversion circuit, the optical component or the imaging A logic circuit for generating a control signal for driving the element,
The logic circuit is
A high-pass filter for processing the output signal of the vibration detection element;
A pan / tilt determination circuit for determining a pan operation or a tilt operation of the imaging apparatus from an output signal from the vibration detection element processed by the high-pass filter ;
During imaging, the gain value for amplifying the output signal from the vibration detection element processed by the high-pass filter is adjusted according to the determination result of the pan / tilt determination circuit,
A gain adjustment circuit that sets a gain value for amplifying an output signal from the vibration detection element regardless of the determination result at the time of abnormality determination of the vibration detection element;
The amplitude of the output signal from the vibration detection element that disables the high-pass filter, is fixed to the imaging device in a state where there is no pan operation, tilt operation, and camera shake operation, and is converted into a digital signal by the analog / digital conversion circuit based on the output signal from the gain adjustment circuit to amplify a, characterized in that the output signal from the previous SL gain adjustment circuit performs the abnormality determination of which is the vibration detecting device is abnormal if not within a predetermined amplitude range Vibration correction control circuit. 請求項１に記載の振動補正制御回路であって、
前記ロジック回路は、
撮像時において、前記アナログ／デジタル変換回路でデジタル化された前記振動検出素子からの出力信号を受けて、第１の周波数以上の信号のみを前記ゲイン調整回路へ出力し、
前記振動検出素子の異常判定時において、前記ハイパスフィルタの無効化に代えて、前記アナログ／デジタル変換回路でデジタル化された前記振動検出素子からの出力信号を前記第１の周波数よりも低い第２の周波数以上の信号のみを前記ゲイン調整回路へ出力するように前記ハイパスフィルタを設定する、
ことを特徴とする振動補正制御回路。 The vibration correction control circuit according to claim 1,
The logic circuit is
Upon imaging, an output signal from the vibration detection element digitized by the analog / digital conversion circuit is received, and only a signal having a first frequency or higher is output to the gain adjustment circuit,
At the time of abnormality determination of the vibration detection element , instead of disabling the high-pass filter, an output signal from the vibration detection element digitized by the analog / digital conversion circuit is lower than the first frequency. The high-pass filter is set so that only a signal having a frequency equal to or higher than that is output to the gain adjustment circuit.
A vibration correction control circuit characterized by that. 請求項１又は２に記載の振動補正制御回路であって、
前記振動検出素子からの出力信号の振幅が第１閾値以下、又は、前記第１閾値より大きい第２閾値以上である場合に前記振動検出素子が異常であると判定することを特徴とする振動補正制御回路。 The vibration correction control circuit according to claim 1 or 2,
A vibration correction characterized by determining that the vibration detection element is abnormal when an amplitude of an output signal from the vibration detection element is equal to or less than a first threshold value or equal to or greater than a second threshold value greater than the first threshold value. Control circuit. 請求項１〜３のいずれか一項に記載の振動補正制御回路であって、
前記振動検出素子の出力信号を撮像時よりも大きいゲイン値で増幅した出力信号の振幅に基づいて、前記振動検出素子の異常判定を行うこと特徴とする振動補正制御回路。 The vibration correction control circuit according to any one of claims 1 to 3,
A vibration correction control circuit that performs abnormality determination of the vibration detection element based on an amplitude of an output signal obtained by amplifying the output signal of the vibration detection element with a gain value larger than that at the time of imaging. 請求項１〜４のいずれか一項に記載の振動補正制御回路を備えた撮像装置であって、
前記振動検出素子と、
前記光学部品又は前記撮像素子の位置を検出する位置検出素子と、
前記振動補正制御回路に接続され、前記制御信号に応じて前記光学部品又は前記撮像素子を駆動する駆動素子と、
を備えたことを特徴とする撮像装置。
An imaging apparatus comprising the vibration correction control circuit according to any one of claims 1 to 4,
The vibration detecting element;
A position detection element for detecting the position of the optical component or the image sensor;
A drive element connected to the vibration correction control circuit and driving the optical component or the image sensor in accordance with the control signal;
An imaging apparatus comprising:
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KR101058332B1 (en) 2011-08-22
US8570385B2 (en) 2013-10-29

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